EP1644753B1 - Hardware-architektur für bearbeitung von galileo alternate binary offset carrier (altboc) signalen - Google Patents

Hardware-architektur für bearbeitung von galileo alternate binary offset carrier (altboc) signalen Download PDF

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EP1644753B1
EP1644753B1 EP03769085A EP03769085A EP1644753B1 EP 1644753 B1 EP1644753 B1 EP 1644753B1 EP 03769085 A EP03769085 A EP 03769085A EP 03769085 A EP03769085 A EP 03769085A EP 1644753 B1 EP1644753 B1 EP 1644753B1
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code
composite
signal
codes
receiver
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EP1644753A1 (de
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Neil Gerein
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Agence Spatiale Europeenne
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/40—Correcting position, velocity or attitude
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/29—Acquisition or tracking or demodulation of signals transmitted by the system carrier including Doppler, related
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/24—Acquisition or tracking or demodulation of signals transmitted by the system
    • G01S19/30—Acquisition or tracking or demodulation of signals transmitted by the system code related
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/35—Constructional details or hardware or software details of the signal processing chain
    • G01S19/37—Hardware or software details of the signal processing chain

Definitions

  • the invention relates generally to GNSS receivers and, in particular, to receivers that operate with Galileo AltBOC satellite signals.
  • GPS receivers such as GPS receivers
  • the GPS satellites transmit signals using two carriers, namely, an L1 carrier at 1575.42 MHz and an L2 carrier at 1227.60 MHz.
  • Each carrier is modulated by at least a binary pseudorandom (PRN) code, which consists of a seemingly random sequence of ones and zeros that periodically repeat.
  • PRN binary pseudorandom
  • code chips The ones and zeros in the PRN code are referred to as "code chips,” and the transitions in the code from one to zero or zero to one, which occur at “code chip times,” are referred to as “bit transitions.”
  • code chips the transitions in the code from one to zero or zero to one, which occur at "code chip times” are referred to as “bit transitions.”
  • bit transitions Each GPS satellite uses a unique PRN code, and thus, a GPS receiver can associate a received signal with a particular satellite by determining which PRN code is included in the signal.
  • the GPS receiver calculates the difference between the time a satellite transmits its signal and the time that the receiver receives the signal. The receiver then calculates its distance, or "pseudorange,” from the satellite based on the associated time difference. Using the pseudoranges from at least four satellites, the receiver determines its global position.
  • the GPS receiver synchronizes a locally generated PRN code with the PRN code in the received signal by aligning the code chips in each of the codes.
  • the GPS receiver determines how much the locally-generated PRN code is shifted, in time, from the known timing of the satellite PRN code at the time of transmission, and calculates the associated pseudorange. The more closely the GPS receiver aligns the locally-generated PRN code with the PRN code in the received signal, the more precisely the GPS receiver can determine the associated time difference and pseudorange and, in turn, its global position.
  • the code synchronization operations include acquisition of the satellite PRN code and tracking the code.
  • the GPS receiver To acquire the PRN code, the GPS receiver generally makes a series of correlation measurements that are separated in time by a code chip. After acquisition, the GPS receiver tracks the received code. It generally makes "early-minus-late" correlation measurements, i.e., measurements of the difference between (i) a correlation measurement associated with the PRN code in the received signal and an early version of the locally-generated PRN code, and (ii) a correlation measurement associated with the PRN code in the received signal and a late version of the local PRN code.
  • the GPS receiver uses the early-minus-late measurements in a delay lock loop (DLL), which produces an error signal that is proportional to the misalignment between the local and the received PRN codes.
  • the error signal is used, in turn, to control the PRN code generator, which shifts the local PRN code essentially to minimize the DLL error signal.
  • DLL delay lock loop
  • the GPS receiver also typically aligns the satellite carrier with a local carrier using correlation measurements associated with a punctual version of the local PRN code. To do this the receiver uses a carrier tracking phase lock loop.
  • a GPS receiver receives not only line-of-sight, or direct path, satellite signals but also multipath signals, which are signals that travel along different paths and are reflected to the receiver from the ground, bodies of water, nearby buildings, etc.
  • the multipath signals arrive at the GPS receiver after the direct-path signal and combine with the direct-path signal to produce a distorted received signal.
  • This distortion of the received signal adversely affects code synchronization operations because the correlation measurements, which measure the correlation between the local PRN code and the received signal, are based on the entire received signal - including the multipath components thereof.
  • the distortion may be such that the GPS receiver attempts to synchronize to a multipath signal instead of to the direct-path signal. This is particularly true for multipath signals that have code bit transitions that occur close to the times at which code bit transitions occur in the direct-path signal.
  • the delay spacing is narrowed such that the noise correlates in the early and late correlation measurements.
  • the narrow correlators are essentially spaced closer to a correlation peak that is associated with the punctual PRN code correlation measurements than the contributions of many of the multipath signals. Accordingly, the early-minus-late correlation measurements made by these correlators are significantly less distorted than they would be if they were made at a greater interval around the peak. The closer the correlators are placed to the correlation peak, the more the adverse effects of the multipath signals on the correlation measurements are minimized.
  • the delay spacing can not, however, be made so narrow that the DLL can not lock to the satellite PRN code and then maintain code lock. Otherwise, the receiver cannot track the PRN code in the received signal without repeatedly taking the time to re-lock to the code.
  • the L1 carrier is modulated by two PRN codes, namely, a 1.023 MHz C/A code and a 10.23 MHz P-code.
  • the L2 carrier is modulated by the P-code.
  • a GPS receiver constructed in accordance with the above-referenced patents acquires the satellite signal using a locally generated C/A code and a locally generated L1 carrier. After acquisition, the receiver synchronizes the locally generated C/A code and L1 carrier with the C/A code and L1 carrier in the received signal, using the narrow correlators in a DLL and a punctual correlator in the carrier tracking loop. The receiver may then use the C/A code tracking information to track the L1 and/or L2 P-codes, which have known timing relationships with the C/A code, and with each other.
  • the L2 carrier is also modulated by a C/A code that is, in turn, modulated by a 10.23 MHz square wave.
  • the square wave modulated C/A code which we refer to hereinafter as the "split C/A code," has maximums in its power spectrum at offsets of ⁇ 10 MHz from the L2 carrier, or in the nulls of the power spectrum of the P-code. The split C/A code can thus be selectively jammed, as necessary, without jamming the L2 P-code.
  • the autocorrelation function associated with the split C/A code has an envelope that corresponds to the autocorrelation of the 1.023MHz C/A code and multiple peaks within the envelope that correspond to the autocorrelation of the 10.23 MHz square wave. There are thus 20 peaks within a two chip C/A code envelope, or a square wave autocorrelation peak every 0.1 C/A code chips.
  • the multiple peaks associated with the square wave are each relatively narrow, and thus, offer increased code tracking accuracy, assuming the DLL tracks the correct narrow peak.
  • the receiver then tracks the center peak directly, with a locally generated split-C/A code.
  • Galileo The European Commission and the European Space Agency (ESA) are developing a GNSS known as Galileo. Galileo satellites will transmit signals in the E5a band (1176.45MHz) andE5b band (1207.14MHz) as a composite signal with a center frequency of 1195.795 MHz using a proposed modulation known as Alternate Binary Offset Carrier(AltBOC).
  • AltBOC Alternate Binary Offset Carrier
  • the GNSS satellites each transmit unique PRN codes and a GNSS receiver can thus associate a received signal with a particular satellite. Accordingly, the GNSS receiver determines respective pseudoranges based on the difference between the times the satellites transmit the signals and then times the receiver receives the AltBOC signals.
  • An example of the GNSS receiver is described by Frédéric Bastide, Olivier Julien, Christophe Macabiau, Benoit Roturier in the document " Analysis of L5/E5 acquisition, tracking and data demodulation thresholds", Proceeding of the Institute of Navigation (ION), GPS (24-09-2002), pages 2196-2207 .
  • a standard binary offset carrier (BOC) modulates a time domain signal by a sine wave sin(w0t), which shifts the frequency of the signal to both an upper sideband and a corresponding lower sideband.
  • the BOC modulation accomplishes the frequency shift using a square wave, or sign(sin(w0t)), and is generally denoted as BOC(fs,fc), where fs is the subcarrier (square wave) frequency and fc is the spreading code chipping rate.
  • the factors of 1.023 MHz are usually omitted from the notation for clarity so a BOC(15.345 MHz, 10.23 MHz) modulation is denoted BOC(15,10).
  • the BOC modulation which produces, for example, signals that are similar to the split C/A code discussed above, allows a single spreading, or PRN, code on each of the in-phase and quadrature carriers.
  • the modulation of a time domain signal by a complex exponential e w0t shifts the frequency of the signal to the upper sideband only.
  • the goal of the AltBOC modulation is to generate in a coherent manner the E5a and E5b bands, which are respectively modulated by complex exponentials, or subcarriers, such that the signals can be received as a wideband "BOC-like signal.”
  • the E5a and E5b bands each have associated in-phase and quadrature spreading, or PRN, codes, with the E5a codes shifted to the lower sideband and the E5b codes shifted to the upper sideband.
  • the respective E5a and E5b quadrature carriers are modulated by dataless pilot signals, and the respective in-phase carriers are modulated by both PRN codes and data signals.
  • a GNSS receiver may track either the E5a codes or the E5b codes in a manner that is similar to the tracking of the split C/A code discussed above.
  • One proposed receiver produces local versions of the AltBOC composite codes using the same look-up tables that the Galileo satellites use to generate the signals for transmission, that is, the tables that correspond to the underlying phase shift keying (PSK) spreading codes.
  • PSK phase shift keying
  • the proposed receiver must thus not only maintain large look-up tables for each of the codes transmitted by the respective Galileo satellites, the receiver must also operate complex circuitry that controls entry to the look-up tables each time a new code chip is received.
  • the tables are even larger and entering them more complicated when different pilot codes are used on the E5a and E5b bands, as is now contemplated.
  • the invention is a GNSS receiver that tracks the AltBOC (15,10), or composite E5a and E5b, codes using hardware that locally generates the complex composite signal by combining separately generated real and the imaginary components of the complex signal.
  • the receiver produces a local version of the composite pilot code as a combination of the locally generated real and imaginary pilot signal components.
  • the receiver thus operates PRN code generators that produce replica E5a and E5b PRN codes and square wave generators that generate the real and imaginary components of the upper and lower subcarriers.
  • the receiver removes the complex composite code from the received signal by multiplying the received signal, which has been downconverted to baseband I and Q signal components, by the locally generated complex composite code.
  • the receiver uses the results, which are correlated I and Q prompt signal values, to estimate the center frequency carrier phase angle tracking error.
  • the error signal is used to control a numerically controlled oscillator that operates in a conventional manner, to correct the phase angle of the locally generated center frequency carrier.
  • the receiver also uses early and late versions of the locally generated complex composite pilot code in a DLL, and aligns the locally generated composite pilot code with the received composite pilot code by minimizing the corresponding DLL error signal.
  • the receiver determines its pseudorange and global position in a conventional manner. Further, as discussed in more detail below, the receiver uses a separate set of correlators to align locally generated versions of the in-phase composite PRN codes with the in-phase channel codes in the received signal, and thereafter, recover the data that is modulated thereon.
  • the invention is directed to a receiver for use with a global navigation satellite system that transmits Alternate binary offset carrier, or AltBOC signals, the receiver comprising:
  • the invention also relates to a method of determining global position from Alternate binary offset carrier, or AltBOC, signals received from a global navigation satellite system, the method comprising the steps of:
  • the Galileo AltBOC modulation scheme generates an AltBOC (15,10) signal that is "BOC(15, 10)-like" signal with the E5a and E5b bands having their own respective spreading, or PRN, codes on their in-phase and quadrature carriers.
  • the AltBOC (15,10) signal has a center carrier frequency of 1191.795HMz and a subcarrier frequency of 15.345 MHz, with the E5a band (1176.45 MHz) as the lower sideband and the E5b band (1207.14 MHz) as the upper sideband.
  • the AltBOC (15,10) signal is generated on the satellite as a constant envelope signal that includes on the in-phase channel a composite of the E5a and E5b spreading, or PRN, codes and data, on the quadrature channel and a composite of the E5a and E5b dataless PRN, or pilot, codes.
  • Fig. 1 depicts the frequency spectrum of an AltBOC PRN quadrature channel sequence.
  • the idealized normalized autocorrelation function for the AItBOC (15,10) signal is shown in Fig. 2.
  • the envelope 100 of the autocorrelation function 111 is the autocorrelation function of a 10.23 MHz chipping rate signal and the multiple peaks of the autocorrelation function 111 are associated with the 15.3454 MHz subcarrier, which can be thought of as a complex square wave code.
  • a GNSS receiver 10 in tracking the AltBOC (15,10) Galileo satellite signals are discussed below.
  • the operations for tracking the quadrature dataless pilot codes as a composite code are discussed.
  • Section 2 the operations for recovering the E5a and E5b data from the in-phase composite data codes are discussed. The discussion below assumes that the receiver has acquired the center frequency carrier using a conventional carrier tracking loop (not shown).
  • c 1 is the in-phase E5b code
  • c 2 is the in-phase E5a code
  • c 3 is the quadrature E5b code
  • c 4 is the quadrature E5a code
  • the E5b and E5a spreading codes are modulated, respectively, on the upper carrier er(t) and the lower carrier er*(t), which is the complex conjugate of er(t).
  • the composite pilot code which is on the quadrature channel of the AltBOC (15,10) signal, includes the E5a and E5b quadrature codes c 4 (t) and c 3 (t).
  • the receiver produces the local version of the complex composite pilot code by combining locally generated real and imaginary signal components, as discussed in more detail with reference to Fig. 4.
  • the receiver then correlates the locally generated composite pilot code with the corresponding composite pilot code in the received signal, as discussed in more detail with reference to Fig. 5 below.
  • the receiver determines associated pseudoranges and its global position in a conventional manner.
  • a GNSS receiver 10 receives over an antenna 12 a signal that includes the AltBOC composite codes transmitted by all of the satellites that are in view.
  • the received signal is applied to a downconverter 14 that, in a conventional manner, converts the received signal to an intermediate frequency (“IF") signal that has a frequency which is compatible with an analog-to-digital converter 18.
  • IF intermediate frequency
  • the IF signal is next applied to an IF bandpass filter 16 that has a bandpass at the desired center carrier frequency.
  • the bandwidth of the filter 16 should be sufficiently wide to allow the primary harmonic of the AltBOC composite pilot code to pass, or approximately 1192 MHz. The wide bandwidth results in relatively sharp bit transitions in the received code, and thus, fairly well defined correlation peaks.
  • the analog-to-digital converter 18 samples the filtered IF signal at a rate that satisfies the Nyquist theorem and produces corresponding digital inphase (I) and quadrature (Q) signal samples in a known manner.
  • the I and Q digital signal samples are supplied to a Doppler removal processor 20 that operates in a known manner, to produce baseband I baseband and Q baseband samples by rotating the signals in accordance with an estimate of the center frequency carrier phase angle.
  • the estimate of the carrier phase angle is based in part on the signals produced by a carrier numerically controlled oscillator ("carrier NCO") 30, which is adjusted in accordance with carrier phase error tracking signals produced by a correlation subsystem 22.
  • carrier NCO carrier numerically controlled oscillator
  • the I baseband and Q baseband samples are next supplied to the correlator subsystem 22, which makes correlation measurements by multiplying the samples by early, prompt and late or early minus late versions of locally generated composite pilot codes produced by a composite code generator 24.
  • the operations of the composite code generator and the correlator subsystem are discussed below with reference to Figs. 4 and 5, respectfully.
  • the I and Q correlation measurements associated with the early, prompt and late or early minus late versions of the local-composite pilot code are supplied to an integrate and dump circuit 26, which separately accumulates the respective I and Q measurements over predetermined intervals. At the end of each interval, the integrate and dump circuit 26 supplies the results of the respective I and Q accumulations, that is, the I and Q correlation signals, to a controller 40.
  • the controller then controls the carrier NCO 30 and the composite code generator 24, to align the locally generated composite pilot code with the corresponding composite code in the received signal.
  • the GNSS receiver 10 tracks the AltBOC (15,10) signals using a locally generated composite pilot code that is generated from locally produced real and imaginary composite signal components.
  • the operations performed by the composite code generator 24 to produce the locally generated composite pilot code components are now discussed in detail with reference to Fig. 4.
  • the composite code generator 24 includes c 3 and c 4 PRN code generators 242 and 243 that produce, respectively, local versions of the E5a and E5b PRN codes for a given GNSS satellite.
  • the code generator 24 further includes two square wave generators 244 and 245 that produce values of cr and sr that correspond to the real and imaginary components of the upper and lower carriers er(t) and er*(t).
  • the controller uses the correlation signals to control the relative timing of the locally produced c 3 and c 4 code chips and the transitions of the cr and sr square waves, which can be thought of as respective code patterns of 0, 1, 0...., and so forth.
  • the composite code generator 24 adds together the c 3 and c 4 code chips in an adder 240 and multiplies the sum in multiplier 246 by the value of cr, which is sign( cos ( ⁇ f s t), to produce the real component of the locally generated composite pilot code.
  • the real component of the composite pilot code is hereinafter referred to as "I Pilot .”
  • the composite code generator produces the imaginary component of the composite pilot code by inverting the c 3 code chips in an inverter 248, adding the inverted c 3 code chip to the corresponding c 4 code chip in an adder 250 and, in multiplier 252, multiplying the result by sr, which is sign( sin ( ⁇ f s t ) .
  • the imaginary component of the locally generated composite pilot code is hereinafter referred to as "Q pilot .”
  • the correlator subsystem 22 multiplies the received composite pilot code by the locally generated composite pilot code. Based on the results, the controller 40 adjusts the PRN code and square wave generators 242-245 to align the local code to the received code.
  • the receiver includes similar circuits for early and late or early-minus-late versions of the locally generated composite pilot code that operate as part of a delay lock loop, or DLL, which operates in a known manner to produce an associated DLL error signal.
  • DLL delay lock loop
  • the correlation subsystem 22 multiplies together two complex signals, namely, the locally generated composite pilot code and the received composite signal.
  • the correlation subsystem manipulates the baseband signals I baseband and Q baseband provided by the Doppler removal processor 20 and the locally-generated real and imaginary signal components I pilot and Q pilot provided by the code generator 24, to produce the real and imaginary components of the correlation signal.
  • the correlation subsystem 22 multiples the I baseband signal by the I pilot signal in multiplier 502, and the Q baseband signal by the Q pilot signal in multiplier 510.
  • An adder 506 then adds the two products together and provides the result to an integrate and dump circuit 516.
  • the integrate and dump circuit 516 accumulates the sums produced by the adder 506 and at appropriate times produces a corresponding real component, or I prompt , signal.
  • the correlation subsystem multiplies the Q baseband signal by the I pilot signal in a multiplier 508 and multiplies the I baseband signal by the Q pilot signal in a multiplier 504.
  • the product produced by the multiplier 504 is inverted by inverter 512 and added to the product produced by the multiplier 508 in an adder 514.
  • the adder 514 then supplies the sums to the integrate and dump circuit 518, which accumulates the sums and at appropriate times produces a corresponding Q prompt signal.
  • the controller 40 (Fig. 3) manipulates the I prompt and Q prompt signals, to determine the center carrier tracking phase error as the arctangent of Q prompt /I prompt .
  • the phase error signal is then used, in a known manner, to control the carrier NCO 30, which in turn controls the Doppler removal processor 20.
  • the controller 40 also receives early and late or early-minus-late I and Q correlation signals. Based on these signals the controller 40 adjusts the generators 242-245 to align the local composite code in the received code and thus minimize the associated DLL error signal.
  • the AltBOC (15,10) signals include both data and spreading codes on the E5a in-phase and E5b in-phase channels.
  • the E5a in-phase channel will carry data that is transmitted at a particular data rate and the E5b in-phase channel will carry different data that is transmitted at a different data rate.
  • the data transitions on the E5a and E5b in-phase channels will, however, occur at corresponding times.
  • the GNSS receiver 10 acquires and tracks the AltBOC (15,10) signal using the composite pilot code, as discussed above. After the removal of the carrier, the receiver recovers the data from the composite in-phase signal using a separate set of correlators, as discussed in more detail below with reference to Fig. 10.
  • c 1 ( t ) ⁇ e j 2 ⁇ f s t + c 2 ( t ) ⁇ e -j 2 ⁇ f s t is similar to the expression for the quadrature spreading, or PRN, codes discussed in Section 1 above.
  • the receiver may recover the (R 1 +R 2 ) data directly from the in-phase I prompt signal.
  • the recovery of the (R 2 -R 1 ) data is not as straight forward.
  • the R 1 +R 2 component of the in-phase composite signal namely, ( R 1 ( ⁇ ) + R 2 ( ⁇ )) ⁇ cos(2 ⁇ f s ⁇ ) has an autocorrelation function that is similar to the autocorrelation function of the composite quadrature channel signal.
  • the R 1 -R 2 signal component of the in-phase composite signal j ⁇ ( R 2 ( ⁇ ) - R 1 ( ⁇ )) ⁇ sin(2 ⁇ f s ⁇ ) does not have a similar autocorrelation function because the sin term goes to zero when ⁇ goes to zero.
  • a correlation operation could be offset so that the operation tracks the correlation peak that corresponds to j ⁇ (R 2 ( ⁇ )- R 1 ( ⁇ )) ⁇ sin(2 ⁇ f s ⁇ ) and the (R 2 -R 1 ) data sequence may then be read from the Q prompt correlator, but with reduced power.
  • the circuitry that generates the local version of the composite signal may instead generate a signal that produces for the (R 2 -R 1 ) term the autocorrelation function ( R 2 ( ⁇ ) - R 1 ( ⁇ )) ⁇ cos(2 ⁇ f s ⁇ ).
  • the local in-phase composite signal thus becomes: c 1 t ⁇ e j ⁇ 2 ⁇ ⁇ f s ⁇ t - c 2 t ⁇ e - j ⁇ 2 ⁇ ⁇ f s ⁇ t
  • the receiver locally produces two combinations of the c 1 (t) and c 2 (t) spreading codes, namely, combinations that correspond, respectively, to the R 1 + R 2 data and the R 2 -R 1 data.
  • the real and imaginary components of the R 2 -R 1 and R 1 + R 2 combinations are locally produced by a code generator 54, which may be part of the local composite code generator 24 (Fig. 3).
  • the code generator adds together the c 1 and c 2 codes in an adder 540 and multiplies the result by the square wave code cr in a multiplier 546.
  • the code generator adds together the c 1 code and an inverted c 2 code in an adder 550 and multiples the result by the square wave code sr in a multiplier 562.
  • the generator also multiplies the sum c 1 + c 2 produced by the adder 540 by the square wave code sr in a multiplier 560, to produce the imaginary component of the R 2 -R 1 combination.
  • the generator further multiplies the sum c 1 -c 2 produced by the adder 550 by the square wave code cr in a multiplier 522, to produce the real component of the R 2 -R 1 code.
  • the receiver uses the locally produced real and imaginary components of the R 1 +R 2 and R 2 -R 1 combinations to recover the data from the composite in-phase code.
  • the system multiplies the in-phase baseband signal I baseband by the real component of R 1 +R 2 in a multiplier 602, and the quadrature baseband signal Q baseband by the imaginary component of R 1 +R 2 in a multiplier 606.
  • the products produced by the multipliers 602 and 606 are then added together in an adder 608 and the sum provided to an integrate and dump circuit 615.
  • the correlation subsystem multiplies the quadrature baseband signal Q baseband by the imaginary component of R 2 -R 1 in a multiplier 610.
  • the system multiplies the real component of the baseband signal I baseband by the real component of R 2 -R 1 , in a multiplier 604 code.
  • the two sums are added together in an adder 612 and provided to an integrate and dump circuit 616.
  • the integrate and dump circuits 615 and 616 accumulate the correlation values produced by the adders 608 and 612, respectively, and at appropriate times produce the R 1 + R 2 prompt and R 1 -R 2 prompt signals. The results are then used to recover the data in accordance with the chart of Fig. 7.
  • circuitry of Figs. 5 and 10 can be combined, as depicted in Fig. 11, to produce a system that tracks the quadrature AltBOC composite code and recovers E5a and E5b data from the in phase AltBOC composite code.

Claims (11)

  1. Empfänger zur Verwendung bei einem globalen Satellitennavigationssystem, das Alternate Binary Offset Carrier- bzw. AltBOC-Signale überträgt, wobei der Empfänger umfasst:
    einen Local-Composite-Code-Generator (24) zum Erzeugen von realen und imaginären Codekomponenten (lpilot, Qpilot) einer lokalen Version eines AltBOC-Composite-Codes, der durch das Kombinieren von lokal erzeugten Codes (c3, c4) mit realen und imaginären Komponenten (cr, sr) von oberen und unteren Subcarriers (er, er*) erhalten wurde;
    ein Korrelations-Subsystem (22, 26) zum Erzeugen von Korrelationssignalen (Ipromt, Qprompt), die sich aus der Korrelation des lokal produzierten Composite-Codes mit dem Composite-Code in einem empfangenen AltBOC-Signal ergeben, durch das Kombinieren von Produkten, die durch das Multiplizieren von Basisband-Inphase- und Basisband-Quadraturkomponenten (I-Basisband, Q-Basisband) des empfangenen Signals mit den lokal produzierten realen und imaginären Composite-Code-Komponenten gebildet werden; und
    einen Controller (40) zum Einstellen des Local-Composite-Code-Generators, um den lokalen Composite-Code mit dem korrespondierenden Composite-Code in dem empfangenen AltBOC-Signal basierend auf den Korrelationssignalen abzugleichen, wobei der Controller Mittel umfasst zum Bestimmen einer globalen Position basierend auf Timing-Differenzen zwischen den Zeiten, zu denen die AltBOC-Composite-Codes übertragen werden, und den Zeiten, zu denen die Codes empfangen werden.
  2. Empfänger nach Anspruch 1, wobei der Local-Composite-Code-Generator (24) umfasst:
    Rechteckwellen-Code-Generatoren (244, 245) zum Erzeugen von realen und imaginären Komponenten (cr, sr) der oberen und unteren Carrier (er, er*),
    einen ersten PRN-Code-Generator (243) zum Erzeugen eines ersten Codes (c3), der auf den oberen Carrier (er) moduliert ist,
    einen zweiten PRN-Code-Generator (242) zum Erzeugen eines zweiten Codes (c4), der auf den unteren Carrier (er*) moduliert ist, und
    Addierer (240, 250) und Multiplizierer (246, 248, 252) zum Kombinieren des ersten und des zweiten Codes (c3, c4) mit den realen und imaginären Komponenten (cr, sr) des oberen und des unteren Carriers (er, er*), um die realen und imaginären Komponenten (Ipilot, Qpilot) des Local-Composite-Codes zu erzeugen.
  3. Empfänger nach Anspruch 1 oder 2, wobei der erzeugte Local-Composite-Code (Ipilot, Qpilot) einem datenlosen Composite-Pilotcode entspricht.
  4. Empfänger nach einem der Ansprüche 1 bis 3, wobei
    der Local-Composite-Code-Generator (24) ferner Mittel umfasst zum Erzeugen von Kombinationen (IR1+R2, QR1+R2, IR1-R2, QR1-R2), die jeweils einer Summe und einer Differenz einer ersten Autokorrelationsfunktion (R1), die einem dritten Code (c1) zugeordnet ist, und einer zweiten Autokorrelationsfunktion (R2), die einem vierten Code (c2) zugeordnet ist, entsprechen,
    wobei das Korrelationssystem (22) ferner Mittel umfasst zum Erzeugen von Kombinations-Korrelationssignalen ((R1+R2)prompt und (R1-R2)prompt), die den jeweiligen Kombinationen entsprechen, und
    wobei der Controller (40) ferner Mittel umfasst zum Wiederherstellen von Daten aus den Kombinations-Korrelationssignalen.
  5. Empfänger nach Anspruch 4, wobei der eine oder die mehreren Addierer (240, 248, 250) einen oder mehrere Inverter (248) zum selektiven Invertieren der Codes (c3, c4) umfassen.
  6. Empfänger nach einem der Ansprüche 3 bis 5, wobei der Local-Code-Generator ferner umfasst:
    einen dritten PRN-Code-Generator (542) zum Erzeugen eines dritten Codes (c1), der auf den oberen Carrier (er) moduliert ist;
    einen vierten PRN-Code-Generator (543) zum Erzeugen eines vierten Codes (c4), der auf den unteren Carrier (er*) moduliert ist;
    einen oder mehrere Addierer (540, 548, 550) zum Kombinieren des dritten und des vierten Codes, um zugehörige Summen zu bilden; und
    einen oder mehrere Multiplizierer (546, 552, 560, 562) zum Multiplizieren jeder Summe einzeln mit der ersten und der zweiten Rechteckwelle (cr, sr), um reale und imaginäre Komponenten (IR1-R2, QR1+R2, IR1-R2, QR1-R2) der jeweils zugehörigen Kombinations-Korrelationssignale ((R1+R2)prompt, (R1-R2)prompt) zu erzeugen.
  7. Verfahren zum Bestimmen der globalen Position aus Alternate Binary Offset Carrier bzw. AltBOC-Signalen, die von einem globalen Navigationssatellitensystem empfangen werden, wobei das Verfahren die folgenden Schritte umfasst:
    das Erzeugen von realen und imaginären Code-Komponenten (lpilot, Qpilot) einer lokalen Version eines AltBOC-Composite-Codes, der durch das Kombinieren von lokal produzierten Codes (c3, c4) mit realen und
    imaginären Komponenten (cr, sr) von oberen und unteren Subcarriers (er, er*) erhalten wurde;
    das Erzeugen von In-Phasen- und Quadraturkomponenten des empfangenen AltBOC-Signals;
    das Korrelieren des lokal produzierten Composite-Codes mit dem Composite-Code in dem empfangenen AltBOC-Signal durch das Kombinieren von Produkten, die durch das Multiplizieren von Basisband-Inphase- und Basisband-Quadraturkomponenten (I-Basisband, Q-Basisband) des empfangenen Signals mit den lokal produzierten realen und
    imaginären Composite-Code-Komponenten gebildet werden, um zugehörige Korrelationssignale (Iprompt, Qprompt) zu erzeugen;
    das Einstellen des Local-Composite-Code-Generators basierend auf den Korrelationssignalen, um den Local-Composite-Code mit dem korrespondierenden Composite-Code in dem empfangenen AltBOC-Signal abzugleichen; und
    das Bestimmen einer globalen Position basierend auf Timing-Differenzen zwischen den Zeiten, zu denen die empfangenen AltBOC-Composite-Codes gesendet werden, und Zeiten, zu denen die Codes empfangen werden.
  8. Verfahren nach Anspruch 7, wobei der Schritt des Erzeugens der lokalen Version des AltBOC-Composite-Codes die folgenden Schritte umfasst:
    das Erzeugen von Rechteckwellen (cr, sr), die den realen und imaginären Komponenten des oberen und des unteren Carriers (er, er*) entsprechen,
    das Erzeugen eines ersten Codes (c3), der auf den oberen Carrier moduliert ist,
    das Erzeugen eines zweiten Codes (c), der auf den unteren Carrier moduliert ist, und
    das selektive Kombinieren des ersten und des zweiten Codes und das Multiplizieren der Ergebnisse mit den realen und den imaginären Komponenten des oberen und des unteren Carriers, um die realen und die imaginären Komponenten (Ipilot, Qpilot) des Local-Composite-Codes zu erzeugen.
  9. Verfahren nach Anspruch 8, wobei der Schritt des selektiven Kombinierens des ersten und des zweiten Codes die Schritte des Bildens der ersten und der zweiten Summe umfasst, die jeweils den realen und den imaginären Komponenten (Ipilot, Qpilot) zugeordnet sind, wobei die erste Summe der Addition des zweiten Codes (c4) mit einem invertierten ersten Code (-c3) und die zweite Summe der Addition der beiden Codes entspricht.
  10. Verfahren nach einem der Ansprüche 7 bis 9, wobei der erzeugte Local-Composite-Code (Ipilot, Qpilot) einem datenlosen Composite-PilotCode entspricht.
  11. Verfahren nach einem der Ansprüche 7 bis 10, ferner umfassend die folgenden Schritte:
    das Erzeugen eines dritten Codes (c1), der auf den oberen Carrier moduliert ist,
    das Erzeugen eines vierten Codes (c2), der auf den unteren Carrier moduliert ist,
    das Erzeugen von zwei Kombinationen des dritten und des vierten Codes mit der ersten und der zweiten Rechteckwelle, um reale und imaginäre Komponenten (IR1-R2, QR1-R2, IR1-R2, QR1-R2) von Kombinationen R1+R2 und R1-R2 zu erhalten, wobei R1 die dem dritten Code (c1) zugeordnete Autokorrelationsfunktion und R2 die dem vierten Code (c2) zugeordnete Autokorrelationsfunktion ist,
    das Korrelieren der Kombinationen, um Kombinations-Korrelationssignale ((R1+R2)prompt, (R1-R2)prompt) für jede Kombination zu erhalten, und
    das Wiederherstellen von Daten aus den Kombinations-Korrelationssignalen.
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